Portion of a vehicle exterior



FIG. 1 is a front perspective view of a portion of a vehicle exterior showing my new design;

FIG. 2 is a rear perspective view thereof; and,

FIG. 3 is a front elevational view thereof.

The jagged heavy lines denote the boundaries of the claimed design and form no part of the claimed design. 

The ornamental design for a portion of a vehicle exterior, as shown and described. 